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@article{DE_1982_18_11_a6, author = {G. D. Dachev}, title = {Boundary value problems for a class of equations of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {1894--1902}, publisher = {mathdoc}, volume = {18}, number = {11}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_11_a6/} }
G. D. Dachev. Boundary value problems for a class of equations of mixed type. Differencialʹnye uravneniâ, Tome 18 (1982) no. 11, pp. 1894-1902. http://geodesic.mathdoc.fr/item/DE_1982_18_11_a6/